Again tonight, Flavion bunker was capped, 2 FBs went axis as predicted, the third, to Dinant went allied? Am I missing something about how FBs work?

When a bunker is capped, what should the FBs to all towns that it links to do, based on ownership of those linked towns?

Are there differences if flags are in those towns? Are there differences if CPs in AOd town are taken or not? Does it remember FB state when the town was first taken by the new owner (and thus revert to that state)? Is there some other condition that affects how the FB will come up after a bunker is capped?